/*
 * Copyright (C) 2011-2014 GUIGUI Simon, fyhertz@gmail.com
 * 
 * This file is part of libstreaming (https://github.com/fyhertz/libstreaming)
 * 
 * Spydroid is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package net.majorkernelpanic.streaming.rtp;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import android.util.Log;

/**
 * 
 *   RFC 3267.
 *   
 *   AMR Streaming over RTP.
 *   
 *   Must be fed with an InputStream containing raw AMR NB
 *   Stream must begin with a 6 bytes long header: "#!AMR\n", it will be skipped
 *   
 */
public class AMRNBPacketizer extends AbstractPacketizer implements Runnable {

	public final static String TAG = "AMRNBPacketizer";

	private final int AMR_HEADER_LENGTH = 6; // "#!AMR\n"
	private static final int AMR_FRAME_HEADER_LENGTH = 1; // Each frame has a short header
	private static final int[] sFrameBits = {95, 103, 118, 134, 148, 159, 204, 244};
	private int samplingRate = 8000;

	// TODO

    final int BLOCK_SIZE[] = { 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 };
    
    
	private Thread t;


	public AMRNBPacketizer() {
		super();
		socket.setClockFrequency(samplingRate);
	}

	public void start() {
		if (t==null) {
			t = new Thread(this);
			t.start();
		}
	}

	public void stop() {
		if (t != null) {
			try {
				is.close();
			} catch (IOException ignore) {}
			t.interrupt();
			try {
				t.join();
			} catch (InterruptedException e) {}
			t = null;
		}
	}

	public void run() {

		int frameLength, frameType;
		long now = System.nanoTime(), oldtime = now;
		byte[] header = new byte[AMR_HEADER_LENGTH];
		boolean isFirst = true;

		try {
			// TODO
			// Skip raw AMR header
//			fill(header,0,AMR_HEADER_LENGTH);
//			
//			if (header[5] != '\n') {
//				Log.e(TAG,"Bad header ! AMR not correcty supported by the phone !");
//				return;
//			}

			while (!Thread.interrupted()) {

				buffer = socket.requestBuffer();
				buffer[rtphl] = (byte) 0xF0;		// rtphl = RtpSocket.RTP_HEADER_LENGTH = 12
//				if(isFirst){
//					addHeadtoAMR(header);
//					save(header, 0, AMR_HEADER_LENGTH, path, true);
//					isFirst = false;
//				}
				// First we read the frame header
				fill(buffer, rtphl+1,AMR_FRAME_HEADER_LENGTH);

				// TODO
				// Then we calculate the frame payload length
				frameType = (Math.abs(buffer[rtphl + 1]) >> 3) & 0x0f;
				frameLength = BLOCK_SIZE[frameType];
				//frameLength = (sFrameBits[frameType]+7)/8;

				// And we read the payload
				fill(buffer, rtphl+2,frameLength);

//				save(buffer, rtphl+1, frameLength+1, path, true);
				
				// RFC 3267 Page 14: "For AMR, the sampling frequency is 8 kHz"
				// FIXME: Is this really always the case ??
				ts += 160L*1000000000L/samplingRate; //stats.average();
				socket.updateTimestamp(ts);
				socket.markNextPacket();

				//Log.d(TAG,"expected: "+ expected + " measured: "+measured);
				
				send(rtphl+1+AMR_FRAME_HEADER_LENGTH+frameLength);
				
			}

		} catch (IOException e) { 
		} catch (InterruptedException e) {}

		Log.d(TAG,"AMR packetizer stopped !");

	}

	private int fill(byte[] buffer, int offset,int length) throws IOException {
		int sum = 0, len;
		while (sum<length) {
			len = is.read(buffer, offset+sum, length-sum);
			if (len<0) {
				throw new IOException("End of stream");
			}
			else sum+=len;
		}
		return sum;
	}


    private void addHeadtoAMR(byte[] array) {

        array[0] = 0x23;
        array[1] = 0x21;
        array[2] = 0x41;
        array[3] = 0x4D;
        array[4] = 0x52;
        array[5] = 0x0A;
    }
	

	public static void save(byte[] buffer, int offset, int length, String path, boolean append) {
        FileOutputStream fos = null;
        try {
            fos = new FileOutputStream(path, append);
            fos.write(buffer, offset, length);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (fos != null) {
                try {
                    fos.flush();
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
	

    public String getFileTime(){
        Date curTime = Calendar.getInstance().getTime();
        DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
        String time  = df.format(curTime).toString();
        return time;
    }
}
